Foundry molding-machine



'W. M. OKEEFE. FOUNDRY MOLDING MACHINE. APPLICATION FILED AUG.H. 1919.

Patented July 20, 1920.

3 SHEETSSHEET 1.

Fig.1

INVENTOR 4 KUII. OKeefe, BY 56mm ATTORNEY W. M. OKEEFE.

FOUNDRY MOLDING MACHINE.

APPLICATION FILED AUG. II. I9I9.

Patented July 20, 1920.

3 SHEETSSHEET 2.

INVENTOR IKMOTfeefe, %/M ATTORNEY w. M. OKEEFE. FOUNDRY MOLDING MACHINE. APPLICATION FILED AUGJI. 1919.

1,347, 1 1 9. Patented July 20, 1920.

3 SHEETSSHEET 3.

Fig.3

I If INVENTOR Izzy/1.0mm BY gmPMk ATTORNEY PATENT OFFICE.

WILLIAM MARTIN OKEEFE, 0F BIRMINGHAM, ENGLAND.

FOUNDRY MOLDING-MACHINE.

Specification of Letters Patent.

Patented July 20,1920;

Application filed August 11, 1919. Serial No. 316,848.

To all whom it may concern:

Be it known that I, VVTLLIAM MARTIN OKnnrn, a subject of the King of Great Britain and Ireland, residing at Sydney VOl'kS, Sitanhope street, in the city of Birmingham, England, have invented certain new and useful Improvements Relating to Foundry Molding-Machines, of which the following is a specification.

This invention relates to foundry molding machines, and has for its object to construct an improved machine of simple design whereby the consolidation of the sand around the pattern can be conveniently elfected.

The invention comprises the use beneath the pattern and molding box, of a pair of levers so arranged that by means acting on the adjacent ends of the levers the opposite ends can be caused to lift the pattern and box, the levers being subsequently released and the free fall of the pattern and box utilized to consolidate the sand placed in the box. Also the invention comprises the combination and arrangement with the foregoing of. means for turning over the box and for supporting the samein' the inverted position. 7

In the three accompanying sheets of explanatory drawings Figure 1 is a side elevation of a moldin machine constructed in accordancewith this invention.

Fig. 2 is a front elevation with part in section of the upper portion of the machine showing the lever mechanism used in the molding operation and Fig. 3 is a'plan of the same with the top plate removed;

Fig. 4 is a part sectional elevation of the table for supporting the inverted box.

In carrying the invention into effect as shown, a pair of forked levers a are pivoted on shafts c in an approximately horizontal position in the body 5 of the machine. The outer forked ends of the levers a are arranged to act upon the underside of a plate (Z which rests upon the upper side of the body. This plate may serve to carry a separate pattern plate. When as in the machine shown it is desired to make provision for turning over the molding box another plate Z is arranged to rest on the plate (Z. In this case the molding box 6 is carried on the plate Z. Adjacent to the levers is mounted a rotatable shaft 7 having secured to it a wedge-like cam g which when rotated can pass between the adjacent ends of the levers and by depressing the latter causes the outer ends of the levers to lift the plates (5 and Z and the superimposed molding. box which is filled with sand. WVhen the cam leaves the levers the plates and box are released and are returned to the original position by their free fall. The impact of the plates and box on the upper side of the machine body causes the loose sand to consolidate, the operation be ing repeated until the required solidity of the mold is obtained.

To minimize friction between the cam and levers swiveling rollers k are provided on the levers for engagement by the cam. Also rollers as 2' maybe arranged on the ends of the levers which lift the plate. It will be seen in the drawings that the outer ends of each lever are spread apart so that they act on the pattern plate near its four corners and lift the plate evenly. The rollers h are arranged to'yield against springs in order to minimize shock on the driving gear when the cam first comes into contact with the roller. An oil bath; may be provided beneath the cam for lubrication of the cam.

Actuation of the cam may be effected by hand power from a wheel is through a chain and sprocket mechanism as shown, or by mechanical power. To prevent displacement of the plate (Z relatively to the machine frame when lifted by the lovers, guide pins engaging holes in the body may be provided on the plate, or the plate may be formed with a deep flange m around its edges as shown. Also any ordinary provision is made" for securing the molding box to prevent displacement relatively to the plate Z either during molding or in the subsequent operation of turning over. To enable the molding box to be turned over a pair of arms n'are adapted to be detachably connected to the plate Z. These arms are secured to a shaft 0 carried on brackets -0' and movable by a lever p. At the rear of the machine is an adjustable rising and falling table 9 on to which the box can be placed in the inverted position by means of the arms n. Referring to Fig. 4 the table 9 is formed with a stem 7" adjustable within a plunger 8. The table can be adjusted vertically in relation to the plunger and locked by a clamping device consisting of a friction block t actuated by a screw 14. The plunger which can slide vertically in a cylinder o is counterbalanced by weights w acting on chains or cables to passing over pulleys m on the cylinder and attached to extensions y on the plunger. Movement of the plunger is controlled by a lever e pivoted on the cylinder. On one side of its fulcrum this is formed with a wedge earn 2, and on its opposite side lifting effort into the positionfor receiving the molding box. In Fig. 1 the plunger is shown in its lower position. With the molding boxchargedwith sand resting on the table, release of the wedge cam permitsthe plungerto. descend, this movement. being controlled by the brake.

not connected to the table during'the molding operation, but are disconnected there from. ,After thebox has been depositedlin theinverted position on the table 9 it is disconnected fromythe plate Z andlowered by operation of the table. The plate-Z can then be returned to the original position.-

, A'machine as above described is simple and effective and Well adapted for foundry use.v Variation ofdetail may be introduced to meet different requirements.

" Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. In foundry molding machines, the combination with a body, a movable plate sup-;

ported on the body and arranged-tocariy a molding box andpattern, levers pivoted on the body with ends adjacent and the outer endsj located beneath the plate, and a rotarywedgc like. cam adapted during a part of its rotation to act on the adjacent ends,of the levers for raising the outer ends with the plate, the levers and plate being permitted to .return by free falling of theplate whenreleased by the cam, substantially as described. I Y

2. In foundry molding machines, the combination comprising a body,'a quadrilateral. plate supported on the body and arranged It will be understood that the arms nare to carry a moldingbox pattern, forked levers pivoted on the body andhaving their double ends located" beneath and near the corners of the plate, their single ends being situated adjacently, rollers and springs on leased by the cam, substantially as described.

In foundry molding. machines, the

combination comprising a body,-fa plate supported on the body, and arranged to carry a moldingbox'and pattern,ja' pair of levers having one pair of ends adjacent and; the opposite outer ends located beneath the plate, a cam arranged to act on the adjacent ends of the levers for raising; the plate, the latter being permitted to fall freelywhen the levers are released by the cam, arms pivoted on the body and adapted to be detachably connected with the moldingbox,anda supportingtable onto which the box can be transferred and supported, the box being inverted during transfer, substantially as described.

4.1111. foundry molding machines, the

combination comprising a-body, a plate supportedv on the body and arranged to carry a moldingbox and pattern, levers pivoted on the body, a cam acting on the levers for rais- .ing' the plate, the latter being permitted to fall freely when. the leversiare released by the cam, arms pivoted on the body and adapted. to be detachably connectedto the box, a supporting table to which the box can be transferred by. the arms, a plunger on which the tableis adjustably mounted, countel-weights for the plunger, a cylinder in which the plunger can slide, means for clamping the table to the plunger, a wedge cam for securing the plunger to the cylinder, a brake for controlling the movement'of the plunger, relatively to the cylinder, ajlever by which the wedge cam and brake can be actuated, and a spring acting on ;Jthe' lever for automatically 5 bringing the wedge cam into action, substantially as described.

name to thisispecification.

In testimony whereof I have signed my 7 WILLIAM MARTIN QKEEFE. 

